No 12 caranyaa gimana???

No 12 caranyaa gimana???

Jawaban Terkonfirmasi

Nomor a, pakai subtitusi langsung
${3x}^{?} - {7x}^{2} + 6x - 15 \ = 3. {2}^{3} - 7. {2}^{2} + 6.2 - 15 \ = 24 - 28 + 12 - 15 \ = - 7$
nomor b, subtitusi langsung
$frac{5x + 4}{ sqrt{ {x}^{2} - x + 4 } } \ = frac{5.4 + 4 }{ sqrt{ {4}^{2} - 4 + 4 } } \ = frac{20 + 4}{ sqrt{16} } \ = frac{24}{4} = 6$
nomor c, pemfaktoran
$frac{ {x }^{2} - 16}{x - 4} \ = frac{(x - 4)(x + 4)}{(x - 4)} \ = (x + 4) \ = 4 + 4 = 8$
nomor d, pemfaktoran
$frac{ {x}^{2} + x - 6 }{ {x}^{2} - 3x + 2} \ = frac{(x - 2)(x + 3)}{(x - 1)(x - 2)} \ = frac{x + 3}{x - 1} \ = frac{2 + 3}{2 - 1} \ = frac{5}{1} = 5$